The monolithic Ivory package has been separated into several smaller, more specific packages.

Instead of Ivory\HttpAdapter\PsrHttpAdapter, use Http\Client\HttpClient.
The HttpClient simply has a method to send requests.

If you used the Ivory\HttpAdapter\HttpAdapter, have a look at Client Common
and use the Http\Client\Utils\HttpMethodsClient which wraps any HttpClient
and provides the convenience methods to send requests without creating
RequestInterface instances.

Replace usage of GuzzleHttp\ClientInterface with Http\Client\HttpClient.
The send method is called sendRequest.
Instead of the $options argument, configure the client appropriately during set up.
If you need different settings, create different instances of the client.
You can use Plugins to further tune your client.

If you used the request method, have a look at Client Common and
use the Http\Client\Utils\HttpMethodsClient which wraps any HttpClient and
provides the convenience methods to send requests without creating
RequestInterface instances.